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Glutathione Is Involved in the Granular Storage of Dopamine in Rat PC12 Pheochromocytoma Cells: Implications for the Pathogenesis of Parkinson’S Disease

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Glutathione Is Involved in the Granular Storage of Dopamine in Rat PC12 Pheochromocytoma Cells: Implications for the Pathogenesis of Parkinson’S Disease The Journal of Neuroscience, October 1, 1996, 16(19):6038–6045 Glutathione Is Involved in the Granular Storage of Dopamine in Rat PC12 Pheochromocytoma Cells: Implications for the Pathogenesis of Parkinson’s Disease Benjamin Drukarch, Cornelis A. M. Jongenelen, Erik Schepens, Cornelis H. Langeveld, and Johannes C. Stoof Department of Neurology, Graduate School Neurosciences Amsterdam, Research Institute Neurosciences Vrije Universiteit, 1081 BT Amsterdam, The Netherlands Parkinson’s disease (PD) is characterized by degeneration of of DA stores with the tyrosine hydroxylase inhibitor a-methyl- dopamine (DA)-containing nigro-striatal neurons. Loss of the p-tyrosine. In the presence of a-methyl-p-tyrosine, refilling of antioxidant glutathione (GSH) has been implicated in the patho- the DA stores by exogenous DA reduced GSH content back to genesis of PD. Previously, we showed that the oxidant hydro- control level. Lowering of PC12 GSH content, via blockade of gen peroxide inhibits vesicular uptake of DA in nigro-striatal its synthesis with buthionine sulfoximine, however, led to a neurons. Hydrogen peroxide is scavenged by GSH and, there- significantly decreased accumulation of exogenous [3H]DA fore, we investigated a possible link between the process of without affecting uptake of the acetylcholine precursor vesicular storage of DA and GSH metabolism. For this purpose, [14C]choline. These data suggest that GSH is involved in the we used rat pheochromocytoma-derived PC12 cells, a model granular storage of DA in PC12 cells and that, considering the system applied extensively for studying monoamine storage molecular characteristics of the granular transport system, it is mechanisms. We show that depletion of endogenous DA stores likely that GSH is used to protect susceptible parts of this with reserpine was accompanied in PC12 cells by a long- system against (possibly DA-induced) oxidative damage. lasting, significant increase in GSH content the extent of which Key words: Parkinson’s disease; oxidative stress; glutathione; appeared to be inversely related to the rate of GSH synthesis. dopamine; PC12 cells; neurotransmitter uptake; vesicular A similar increase in GSH content was observed after depletion storage Parkinson’s disease (PD) is characterized primarily by a loss of major antioxidant in the brain. Thus, GSH has been shown to dopamine (DA) in the striatum caused by degeneration of DAer- detoxify (organic and inorganic) hydroperoxides including the gic neurons in the zona compacta of the substantia nigra (SN) H2O2 formed during the oxidative metabolism of DA (Spina and (Gibb and Lees, 1991). Although the cause of PD is still unknown, Cohen, 1988, 1989). oxidative stress has been implicated as a pathogenetic factor. To prevent breakdown of DA before its release from presyn- According to this so called “free radical hypothesis,” the degen- aptic endings, the transmitter is taken up and stored in presynap- eration of the nigro-striatal system in PD is related to the rela- tic granules. This process is effected through the action of a tively high exposure of these neurons to reactive oxygen species transporter protein (Johnson, 1988). Interference with granular (ROS), in particular hydrogen peroxide (H2O2), produced during storage, for instance via blockade of the ligand-binding site on the both the enzymatic (monoamine oxidase-catalyzed) and nonenzy- transporter, leads to an enhanced turnover of DA, inducing con- matic (auto-oxidative) breakdown of DA (Adams and Odunze, siderable oxidative stress as a consequence of H2O2 production 1991; Olanow, 1992). Thus, DAergic cell death in PD may be (Spina and Cohen, 1989). Recently, we have shown that, apart caused by an overproduction of ROS and/or a diminished protec- from generating oxidative stress, H2O2 is able to inhibit storage of tion against them. Evidence to support the “free radical hypoth- DA in the nigro-striatal system through an as yet undefined esis” has come from postmortem investigations of PD brains, interaction with the granular uptake mechanism (Langeveld et al., which consistently show an increase in the indices of oxidative 1995). Interestingly, the DA storage system appeared to be sub- stress in the SN at the time of death (Hirsch et al., 1991; Jenner, stantially more sensitive to H2O2 compared with that of other 1993). One of these indices, possibly even preceding the loss of transmitters, such as noradrenaline (NA) and acetylcholine DA (Dexter et al., 1994), is a decrease in the level of glutathione (ACh) (Langeveld et al., 1995). Based on these data, we proposed (GSH) in the Parkinsonian SN (Riederer et al., 1989; Sofic et al., that the degeneration of the nigro-striatal system in PD may be 1992; Jenner, 1993). GSH, the most abundant free thiol in mam- the outcome of a self-sustaining cycle that is initiated by lowering malian cells (Meister and Andersson, 1983), is considered to be a of the capacity to scavenge the H2O2 released during normal DA metabolism, leading to a decrease in the granular storage and Received March 19, 1996; revised July 12, 1996; accepted July 18, 1996. enhanced breakdown of DA, inducing more oxidative stress, dis- We thank Dr. Robbert J. Slingerland (University of Amsterdam) for providing us turbance of neuronal function and, eventually, cell death. Consid- with the PC12 cell line. ering our observation that H2O2 preferentially interferes with Correspondence should be addressed to Dr. Benjamin Drukarch, Research Insti- presynaptic storage of DA and the fact that, in the mammalian tute Neurosciences Vrije Universiteit, Department of Neurology, Boechorststraat 7, 1081 BT Amsterdam, The Netherlands. brain, H2O2 is detoxified mainly by GSH (Maker et al., 1981; Copyright q 1996 Society for Neuroscience 0270-6474/96/166038-08$05.00/0 DiMonte et al., 1992), whose levels are decreased in PD, we Drukarch et al. • Role of Glutathione in Granular Storage of Dopamine J. Neurosci., October 1, 1996, 16(19):6038–6045 6039 initiated a series of in vitro experiments to investigate a possible previously (Westerink and Mulder, 1981; Van Muiswinkel et al., 1995), linkage between granular uptake of DA and GSH metabolism. using a Guardcolumn (Phase Sep, Deeside, UK) in combination with a reverse-phase column filled with Spherisorb (3 mm, SRODS2; Phase Sep) For this purpose, we used a rat pheochromocytoma-derived PC12 and an amperometric electrochemical detector (Antec, Leiden, The cell line (Greene and Tischler, 1976) which, in contrast to tissue Netherlands). The mobile phase consisted of 0.05 M citric acid, 0.05 M slices or primary neuronal cultures, consists of a homogeneous phosphoric acid, 1.5 mM octanesulfonic acid (sodium salt monohydrate, population of DA containing cells that have been demonstrated to Janssen Chimica, Beerse, Belgium), 0.2 mM EDTA, and 5% (v/v) meth- synthesize, store, and release DA in a similar manner as neurons anol, pH 2.5. The detector potential was set at 1750 mV versus a K/KCl reference electrode. Catecholamine content was calculated against stan- (Greene and Rein, 1977). Moreover, these cells are known to dards that had been subjected to the same treatment as the samples. contain both GSH and the enzyme systems involved in its metab- Cell survival assay. To determine cell survival, we used the 3-(4,5- olism (Pan and Perez-Polo, 1993; Sampath et al., 1994). dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay as described previously (Langeveld et al., 1992) with some adaptations. An MATERIALS AND METHODS MTT stock solution was prepared and stored at 2208C. On the day of the assay, 100 ml of MTT solution (5 mg/ml) was added to each well of the Materials. Radiolabeled DA and choline were obtained from Amersham culture dishes containing 1 ml of culture medium. Subsequently, incuba- International (Little Chalfont, UK). DL-a-methyl-p-tyrosine (aMPT) was tion of the cultures took place for 2 hr at 378C under an atmosphere of from Research Biochemicals (Natick, MA), and reserpine was from De 5% CO2/95% air. Thereafter, the medium was removed and replaced by Onderlinge Pharmaceutische Groothandel (Utrecht, The Netherlands). Tis- 2 ml of dimethylsulfoxide (DMSO) to which 0.5% (v/v) FCS had been sue culture media and supplements were obtained from Gibco Netherlands added. After formazan solubilization by vibration on a plate shaker, a 150 BV (Breda, The Netherlands), whereas all other chemicals and drugs, unless ml sample was drawn from this solution and pipetted into a microtiter noted otherwise, were obtained from Sigma (St. Louis, MO). plate. The absorbance of each well was measured at 540 nm using the Cell culture. PC12 cells, originally described by Greene and Tischler 2 TitertekPlus microplate reader described above. Absorbance data were (1976), were grown in 80 cm tissue culture flasks containing DMEM/ calculated by subtracting the mean of “background” readings obtained Ham’s F-10 (1:1) supplemented with 15% fetal calf serum (FCS), 2 mM from identical incubations in the absence of cells. L-glutamine, penicillin (100 U/ml), and streptomycin (50 mg/ml) at 378C Radioligand uptake. Cells were rinsed free of culture medium and under an atmosphere of 5% CO2/95% air. After 1 week, in which the preincubated for 30 min at 378Cin500ml of a phosphate buffer, pH 7.3, culture medium had been changed once or twice, the medium was consisting of (in mM): NaCl 137, KCl 2.7, Na HPO 8, KH PO 1.5, removed and the cells were trypsinized according to Van Muiswinkel et 2 4 2 4 MgCl2 0.5, CaCl2 1.2, and D-(1)-glucose 5. To this buffer 0.5% (w/v) al. (1995). After trypsinization, viable cells in the resulting cell suspension bovine serum albumin (BSA) had been added. Subsequently, the cultures were counted by trypan blue exclusion in a hemocytometer. Subsequently, were washed and incubated for 20 min with BSA containing buffer to cells were plated in 12-well culture dishes, containing 1 ml of culture 3 M 5 which [ H]DA (specific activity 45 Ci/mmol; final concentration 65 n ) medium in each well, at a density of 2.5 3 10 cells/well for all experi- and/or [14C]choline (specific activity 55 mCi/mmol; final concentration 8.5 ments.
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